Hydrocarbons (aliphatic and aromatic) and metals (heavy metals and major elements) were measured in both at mospheric deposition and roof run off in central Paris (France). Atmospheric deposition (wet and dry) was collected from December 2001 to October 2002 and roof runoff was sampled on three buildings with different covering materials, i.e., slate tiles and zinc sheets. This paper gives anover view of the results on the flux and distribution points of view for both atmospheric deposition and roof runoff. Results show that atmospheric fluxes of hydrocarbon sandmajorelements increase during cold seasons, due to residential heating occurrence, while heavy metals, whose major sources have constante mission fluxes, exhibit steady atmospheric loads throughout the year. More over, hydrocarbon fingerprints reveal mainly biogenic and pyrolytic origins for aliphatic and aromatic hydrocarbons, respectively. The results about roof runoff contamination suggest that the scavenging processes for hydrocarbons and metals are dependent on rainfallamountratherthanontherainevent characteristics (number, intensity, duration), and dry deposition weakly contributes to the pollutant loads in roof runoff. Results also highlight that both metallic and slate roofs do not act as a source of hydrocarbonsandmajorelements–exclusivelyoriginatingfromatmosphericdeposition–whilethey act as a source of some heavy metals. Zinc-covered roofs largely release Zn and Ti, while slate roofs mainly release Pb, Ti and Cu. What ever the material used for roof covering, roof runoff presents high Ni and V loads due to the vicinity of the chimney stacks of heating boilers.
Hydrocarbons and metals in atmospheric deposition and roof runoff in central Paris
Water, Air, and Soil Pollution - Volume 159 – Issue 1
2004
